Incandescent lamp with diffusing lamelle



April 2, 1935.

C. WEIDNER INCANDESCENT LAMP WITH DIFFUSING LAMELLIE Filed Aug. 31, 1951 Patented Apr. 2, 1935 a g i j UNITED STATES PATENT OFFlC-E x Carl Weidner, Berlin, Germany; assignor to Paul '11. von Schele, Chicago, 111.

Application August 31, 1931, Serial No. 560,527

2 Claims. (01. 240-485) The invention relates to incandescent lamps On account of the shape of the lamellae and the and more particularly to incandescent lamps proelasticity of the spiral belt 3, the first will be vided with diffusing lamella. pressed against the glass guard so that a direct The object of the invention is to provide for contact is being maintained. It is also possible means by which the rays of light of a luminous to cast lamellee composed of a material other than 5 source such as for anautomobile headlight are glass integral with the glass guard and so to enintercepted, diffused and so influenced as to their sure the tight contact between lamellae and glass efiect that they do not dazzle an observer, butv respectively. without the luminous power being diminished in The lamellae 2 are desirably formed of thin the least. 1 normally rigid but slightly flexible opaque pol- 10 Devices intended for attaining this aim have ished metal strips and are held together at their been already known and consist in that the forward ends as here shown by a relatively small source of light is surrounded by reflecting blades ring 4 which passes loosely through suitable holes of various shape and adjustment; so-called in the lamellw. A small finishing button 5 may 5 lamellae, the effect of which however is rather be carried at this end, prongs 6 on the button slight or even adversely affects the luminous being passed through the ring after the lamellae power, as their independent arrangement, for inare secured thereto and bent apart to retain the stance at the lamp socket or the reflectorrebutton in place. The lamellee thus converge at quires a definite distance of their bodies from the their forward ends upon the axis of the lamp,

source of light in order that the incandescent and the bulb is substantially unobstructed except an lamp is not liable to be damaged. On account for the lamella in the region adjacent its axis. of this independent arrangement it is necessary to At their rear ends, the lamellae' are secured to provide for separate holders increasing the cost the sp belt this instance y haVihg Slots of production. I hooked into the spring, thus preventing the According to the present invention and in conlamellae from falling apart at their rear ends 5 trast to the devices already known the lamellae W le at't e Sa e time maintaining them in are fastened directly to the incandescent lamp or siliently spaced apart relationship about the axis. to the glass guard thereof so that the said lamellee S0 constructed and arranged, the bundle of lamdirectly surround the lamp or the guard without ellee can be spread apart at its rear end to be being clear off. In case the lamellae are not inpp v the glass guard bulb Of the l p, 30 I tegral with the glass guard of the incandescent the resilient belt expanding for this purpose and lamp, they may be slid over as a self-contained, then contracting to cause the lamellae to grip the bundle and, if required, changed without the bulb. 1 c

incandescent lamp being removed which is im- As clearly shown by the f w t W be The following is given as an example and (16- surface of the bulb at an angle less than normal scribed with reference to thev drawing attached o Said u pa y at e wa d end Of which constitutes part of this application. the b 50 a a of t e a llfie has a some- Fig. I thereof shows a lamp with lamellae slid what wa d y as Well s a a y di ectedsur- 40 over; face, which diffuses the light from the bulb not v Fig, II is a, top plan iew of a, lamp provided only laterally but forwardly of the bulb, each Of with the lamellae referred to; the lamellae being bent longitudinally-in an ogee Figure III is a cross-section taken on the line curve to n a ce t effect The amellee bei III-III of Figure IV; and desirably metallic and in contact with thelamp Figure IV is a longitudinal section taken on the b for Substantially their entire Serve 45 line of one of the lamellae. also as radiating fins which serve tokeep the Over the source of light or incandescent lamp lamp bulb cool and thus lengthen its life. v I is slipped a bundle of lamellae which bundle con- What I claim as my invention, and desire to sists of single lamellae Zwound or helically formed secure by Letters Patent is:

and made of burnished light metal or another 1. In light-diffusing means foran incandescent'50 suitable material. The said bundle is supported lamp, the combination of a plurality of separated by the glass guard of the incandescent lamp and reflecting lamellae spirally and somewhat radially secured thereon by a belt laid around the lamp disposed about an axis and converging at their base and made of' spirally wound wire or the forward ends substantially on said axis, each of 65 like. the lamellae being bent longitudinally in an ogee portant when the light is to get another colour. n t that each of the lamelle upstends fr the as curve whereby the lamellae have surfaces directed forwardly of said axis as well as laterally thereof; relatively small retaining means at the forward ends of the lamellze to which the lamella are anchored, whereby the region adjacent said axis is substantially unobstructed except for said 1amellaa, and means at the rear of the lamellze maintaining them in spaced-apart relation about said axis.

2. In a light-difiusing device for automobile headlights provided with an incandescent lamp bulb, the combination including a relatively small retaining ring adapted to be disposed concentric with the axis of the bulb at the forward end thereof; a plurality of reflecting lamella: each having a hole therein at its forward end loosely receiving said ring therethrough, said lamellae being spirally directed from said ring rearwardly thereof; and resilient means at the rear of the lamellaa maintaining them in spaced-apart relation but permitting the lamellae to be radially spread apart on said ring to be readily passed over the bulb, and thereafter to be directly supported by the bulb in partially upstanding relation thereto and with one edge of each of the lamellae contacting therewith.

CARL WEIDNER. 

